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/*
* Copyright 2021 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
#include <assert.h>
#include <emscripten.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/uio.h>
#include <unistd.h>
// FIXME: The existing io.c file implements devices, which haven't been
// implemented in the new FS yet.
// This test simply implements the seek portion.
int main() {
char readBuffer[256] = {0};
char writeBuffer[] = "writeme";
int f = open("/file", O_RDWR | O_CREAT);
const char* msg = "1234567890";
write(f, msg, strlen(msg));
lseek(f, 0, SEEK_SET);
printf("read from file: %zd\n", read(f, readBuffer, sizeof readBuffer));
printf("data: %s\n", readBuffer);
memset(readBuffer, 0, sizeof readBuffer);
printf("errno: %d\n\n", errno);
errno = 0;
printf("pread past end of file: %zd\n",
pread(f, readBuffer, sizeof readBuffer, 999999999));
printf("data: %s\n", readBuffer);
memset(readBuffer, 0, sizeof readBuffer);
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %lld\n", lseek(f, 3, SEEK_SET));
printf("errno: %d\n\n", errno);
printf("partial read from file: %zd\n", read(f, readBuffer, 3));
printf("data: %s\n", readBuffer);
memset(readBuffer, 0, sizeof readBuffer);
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %lld\n", lseek(f, -2, SEEK_END));
printf("errno: %d\n", errno);
errno = 0;
printf("partial read from end of file: %zd\n", read(f, readBuffer, 3));
printf("data: %s\n", readBuffer);
memset(readBuffer, 0, sizeof readBuffer);
printf("errno: %d\n\n", errno);
errno = 0;
printf("before bad seek: %lld\n", lseek(f, 0, SEEK_CUR));
printf("errno: %d\n", errno);
errno = 0;
printf("bad seek: %lld\n", lseek(f, -15, SEEK_CUR));
printf("errno: %d\n", errno);
errno = 0;
printf("after bad seek: %lld\n", lseek(f, 0, SEEK_CUR));
printf("errno: %d\n", errno);
errno = 0;
printf("partial read from before start of file: %zd\n",
read(f, readBuffer, 3));
printf("data: %s\n", readBuffer);
memset(readBuffer, 0, sizeof readBuffer);
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %lld\n", lseek(f, 0, SEEK_SET));
printf("write to start of file: %zd\n", write(f, writeBuffer, 3));
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %lld\n", lseek(f, 0, SEEK_END));
printf("write to end of file: %zd\n", write(f, writeBuffer, 3));
printf("errno: %d\n\n", errno);
errno = 0;
printf("seek: %lld\n", lseek(f, 10, SEEK_END));
printf("write after end of file: %zd\n",
write(f, writeBuffer, sizeof writeBuffer));
printf("errno: %d\n\n", errno);
errno = 0;
printf("pwrite to the middle of file: %zd\n",
pwrite(f, writeBuffer + 2, 3, 17));
printf("errno: %d\n", errno);
printf("seek: %lld\n\n", lseek(f, 0, SEEK_CUR));
errno = 0;
printf("pwrite past end of file: %zd\n", pwrite(f, writeBuffer, 5, 32));
printf("errno: %d\n", errno);
printf("seek: %lld\n\n", lseek(f, 0, SEEK_CUR));
errno = 0;
ssize_t bytesRead;
printf("seek: %lld\n", lseek(f, 0, SEEK_SET));
printf("read after write: %zd\n",
bytesRead = read(f, readBuffer, sizeof readBuffer));
printf("errno: %d\n", errno);
errno = 0;
printf("final: ");
for (ssize_t i = 0; i < bytesRead; i++) {
if (readBuffer[i] == 0) {
printf("\\0");
} else {
printf("%c", readBuffer[i]);
}
}
printf("\n");
return 0;
}
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